Brake question.... Master Cylinder question to be exact.

Ok. I picked up a master cylinder for our disc swap (front disc rear drum) on our 65 Galaxie.

I ended up getting a 78 or 77 Tbird MC (power MC). I got this ONLY because it was the only one in stock (I had a list of options). Now before I do anything else I have just a few questions, That I need some help with.

1-Is there a difference between a power vs. non-power inside where the rod goes?

2-What should I look for? Does anyone have a pic to share with how the inside of the manual MC looks like in the rod end?Or just a good description.

There is one more, Rather stupid question I have...
In order for the MC to work, Does your brake peddle push or pull on the MC.?? Power vs. non-power?

I do not want to make a bad choice here. And I am looking to learn a little bit more about this topic.

Thanks Y'ALL!

<font size=-1>[ This Message was edited by: wildosvt01 on 4/23/05 12:35am ]</font>

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On 2005-04-22 12:31, wildosvt01 wrote:
Ok. I picked up a master cylinder for our disc swap (front disc rear drum) on our 65 Galaxie.

I ended up getting a 78 or 77 Tbird MC (power MC). I got this ONLY because it was the only one in stock (I had a list of options). Now before I do anything else I have just a few questions, That I need some help with.

1-Is there a difference between a power vs. non-power inside where the rod goes?

2-What should I look for? Does anyone have a pic to share with how the inside of the manual MC looks like in the rod end?Or just a good description.

There is one more, Rather stupid question I have...
In order for the MC to work, Does your brake peddle push or pull on the MC.?? Power vs. non-power?

I do not want to make a bad choice here. And I am looking to learn a little bit more about this topic.

Thanks Y'ALL!

<font size=-1>[ This Message was edited by: wildosvt01 on 4/23/05 12:35am ]</font>
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1: There is no difference in the MC where the rod goes. But there is a differece in the MC itself if you use a power brake MC without the booster it will take a real a strong push to get the brakes to work.

2: The inside of the MC where the rod goes will look like a cup, the end of the rod is like a ball.

3: With both the power and non power MC's the rod pushes into the MC.

Good luck
Gerry
[addsig]

Dang! So I might as well take my *** back to the parts store and get a manual disc front and rear drum MC then huh?

[img]/phpBB/images/smiles/icon_cry.gif[/img]

Thank you so VERY much for chiming in! [img]/phpBB/images/smiles/icon_bow.gif[/img]

Oh just though of something. My reading lead me to think of something.
There is "supposed" to be a difference between brake peddles from power to non-power. Non-power having more leverage. Would this in turn make the harshness of a power MC in my non-power car work out to my benefit?
On the same tocken, I have read that if you use a manual master (non-power) on an originally equipped power braked car it will not work "properly". Like using a power set up in a originally manual braked car works, But is touchy.

So am I still needing ot head back to the autoparts store?

<font size=-1>[ This Message was edited by: wildosvt01 on 4/23/05 12:59am ]</font>

<font size=-1>[ This Message was edited by: wildosvt01 on 4/23/05 1:01am ]</font>

i was under the impression that the mc for manual and power were different. I think the manual has deeper hole for the pushrod

72 replies. Anyone care to chime in with your thoughts on this?[img]/phpBB/images/smiles/icon_smile.gif[/img]
[addsig]

Manual MC normally have a larger bore. I like using MC's from 3/4-1 ton pickups on my manual systems. The larger bore pushes more fluid into the lines (per given movement) and would seem "touchy" if used on a Power setup. Obviously using a smaller bore Power MC on a manual system would place the pedal closer to the floor when braking.

Disk brake and power brake pedals are different than standard drum brakes (at least on early Mustangs) with the pivot being either higher or lower than with a manual drum setup. Sorry but I don't remember which way it is but would guess that the manual pedal is the one that is higher. Irregardless, I've used them both ways and have never really had a problem.

Since you are using manual brakes without a booster, get a MC for manual disk brakes. Alternately, if you were going to use a booster, get one made for power brakes. (In either case, use as an example a 74' PU because they are only offered in disk/drum configuration and available in with or without power).

If you don't like my example, most any early 70's full size car would also work as long as it has disks.

_________________
Dennis



<font size=-1>[ This Message was edited by: dennis111 on 4/24/05 4:35am ]</font>

Awesome advice and insight. Our car had manual drum originally (no kidding right [img]/phpBB/images/smiles/icon_lol.gif[/img]) and thats how I figured the drum brake pedal leverage would overcome any short comings of using a power disc MC on a manual drum car.
[addsig]

[quote]
On 2005-04-23 16:24, dennis111 wrote:
Manual MC normally have a larger bore.
Dennis


That is incorrect. Manual Master Cylinders use a smaller bore there be increasing pressure. Since you have assist in power brakes via the booster you do not need that extra pressure and you use a bigger piston/bore. Most manual disc require a 3/4 inch bore and drums require a 7/8 bore. While Power assisted M/Cs typically range from 1inch to 1 and a 1/4 inch.

Lance

<font size=-1>[ This Message was edited by: 1badmav on 4/24/05 7:26am ]</font>

Thanks 1badmav.

Ours replacment unit has ruffly a 1-1/8th" dia. bore...
I had planned on measuring the dia. of the bore between our stock unit and this one. But your post tells me what I should be seeing once I do it.

I just hope this thread is helping others at the same time!

[img]/phpBB/images/smiles/icon_bow.gif[/img][img]/phpBB/images/smiles/icon_cool.gif[/img][img]/phpBB/images/smiles/icon_tup.gif[/img]
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[quote]
On 2005-04-23 19:24, 1badmav wrote:
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On 2005-04-23 16:24, dennis111 wrote:
Manual MC normally have a larger bore.
Dennis


That is incorrect. Manual Master Cylinders use a smaller bore there be increasing pressure. Since you have assist in power brakes via the booster you do not need that extra pressure and you use a bigger piston/bore. Most manual disc require a 3/4 inch bore and drums require a 7/8 bore. While Power assisted M/Cs typically range from 1inch to 1 and a 1/4 inch.

Lance

<font size=-1>[ This Message was edited by: 1badmav on 4/24/05 7:26am ]</font>
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To illustrate why I made this statement, I offer the following facts. Although I am not familiar with the MC's bore sizes that you are mentioning, I did state what was common in the mid-sixties on Ford vehicles. Standard MC bores were normally 1" while Power MC's were .875" or .937". In the late 60's both became the same at 1".

wildosvt01

The Big Truck MC's for 72' are 1 1/4" for all drum and 1 1/8" for Power (with 1" being standard for 1/2 ton trucks with either MC.) You can check it all out at a auto parts website, such as http://www.partsamerica.com/ProductL...aster+Cylinder
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